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2026-2027 IB Officially verified

Seisen International School

Tokyo, Japan · Asia/Tokyo

Term starts
24 Aug 2026
Term ends
11 Jun 2027
School closures
9
Longest break
19 days
Christmas Break
Next closure at Seisen International School

No classes (Festival recovery day)

Nov 2 – Nov 2, 2026

4
days away

The next date this school is closed to students, taken from its own published calendar. Public holidays are included; staff-only training days are not.

How Seisen International School differs from other schools in Tokyo

Compared against the median dates of the 10 schools we track in Tokyo. A school's own calendar can move a family's travel dates even when the city-wide dates look unchanged.

Break This school City median Difference
Autumn Break 12 Oct – 16 Oct 12 Feb – 12 Feb starts 123 days earlier than the city median ends 119 days earlier than the city median
No classes (Festival recovery day) 2 Nov – 2 Nov 12 Feb – 12 Feb starts 102 days earlier than the city median ends 102 days earlier than the city median
No classes for KG/ES 11 Jan – 11 Jan 12 Feb – 12 Feb starts 32 days earlier than the city median ends 32 days earlier than the city median
No classes for MS/HS 18 Jan – 18 Jan 12 Feb – 12 Feb starts 25 days earlier than the city median ends 25 days earlier than the city median
Winter Break 22 Feb – 23 Feb 12 Feb – 12 Feb starts 10 days later than the city median ends 11 days later than the city median
Spring Break 22 Mar – 26 Mar 22 Mar – 28 Mar ends 2 days earlier than the city median
No classes for KG/ES 3 May – 3 May 12 Feb – 12 Feb starts 80 days later than the city median ends 80 days later than the city median
No classes for MS/HS 28 May – 28 May 12 Feb – 12 Feb starts 105 days later than the city median ends 105 days later than the city median

School closures and holidays

Dates Days Event Type
18 Dec – 5 Jan 2027 19 Christmas Break Winter break
22 Mar – 26 Mar 5 Spring Break Spring break
12 Oct – 16 Oct 5 Autumn Break Other school holiday
2 Nov – 2 Nov 1 No classes (Festival recovery day) Other school holiday
11 Jan – 11 Jan 1 No classes for KG/ES Other school holiday
18 Jan – 18 Jan 1 No classes for MS/HS Other school holiday
22 Feb – 23 Feb 2 Winter Break Other school holiday
3 May – 3 May 1 No classes for KG/ES Other school holiday
28 May – 28 May 1 No classes for MS/HS Other school holiday

Term dates

Every term start and end the school has published. The cards above show the year's first start and final end; a school with three terms has six boundaries in total.

  • 24 Aug 2026 Grades 2, 4, 6, 11, 12 return Term starts
  • 25 Aug 2026 Grades 3, 5, 7, 8, 9, 10, 11, 12 return Term starts
  • 26 Aug 2026 All MS/HS and Grade 1 return Term starts
  • 27 Aug 2026 All ES/MS/HS return (No KG) Term starts
  • 1 Sept 2026 KG returns Term starts
  • 6 Jan 2027 Return to classes Term starts
  • 9 Jun 2027 End of classes for KG Term ends
  • 11 Jun 2027 End of classes for G1-11 (11:30 dismissal) Term ends

Staff training days (school closed to students)

These fall on days that are not public holidays — the school is shut but most workplaces are not.

  • 17 Aug 2026 New Faculty Orientation
  • 18 Aug 2026 All Faculty return
  • 25 Sept 2026 Faculty PD Day (No classes)
  • 27 Nov 2026 Faculty PD Day (No classes)
  • 19 Feb 2027 Faculty PD Day (No classes)

Other dates

  • 5 Sept Welcome New Families Social
  • 21 Sept Parents Back To School Day
  • 23 Oct House Day
  • 31 Oct Seisen International School Festival
  • 23 Nov Online K-12 Parent conference
  • 24 Nov Online MS/HS Parent-Teacher conference
  • 17 Dec Full day of classes
  • 5 Mar In-person Parent-Teacher Conference
  • 14 Mar CIS/NEASC/IB Evaluation Visit
  • 14 May St. Raphaela Day
  • 30 May HS Graduation
  • 14 Jun Summer School Starts
  • 1 Jul Summer School ends (KG)
  • 2 Jul Summer School ends (ES/MS/HS)

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Source

https://resources.finalsite.net/images/v1785982279/seisencom/uek0h5knie5sutbtegvs/26-27SeisenYearatGlance_FINAL.pdf

Data collected for this dataset. It is the date the whole dataset was collected, not a per-school verification date: the school may have published these dates earlier, and its calendar can change after it.

Dates are taken from the calendar published by the school or its authority. Always confirm against the school's own communication before booking travel — calendars change.

Report a date error or source change — this link carries the school and its source URL, so a correction arrives already attached to the right calendar. If the school has republished its calendar, send the new URL rather than an existing page.

Other schools in Tokyo

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